 // 时间格式化
 export function formatDate(date, fmt) {
     if (/(y+)/.test(fmt)) {
         fmt = fmt.replace(RegExp.$1, (date.getFullYear() + "").substr(4 - RegExp.$1.length));
     }

     let o = {
         "M+": date.getMonth() + 1,
         "d+": date.getDate(),
         "h+": date.getHours(),
         "m+": date.getMinutes(),
         "s+": date.getSeconds()
     };

     for (let k in o) {
         if (new RegExp(`(${k})`).test(fmt)) {
             let str = o[k] + "";
             fmt = fmt.replace(RegExp.$1, RegExp.$1.length === 1 ? str : padLeftZero(str));
         }
     }

     return fmt;
 }